【摘要】 根据同步坐标变换和对称分量法,提出了一种三维瞬时复功率计算方法,可以将系统输入功率分解为:瞬时有功功率、q0轴之间、dq轴之间、d0轴之间的瞬时无功功率等12个功率分量。在瞬时功率分析的基础上对抑制交流侧负序电流和抑制交流侧输入功率二次谐波控制两种优化控制方案进行了分析。同时建立了基Saber的PWM整流器仿真平台,通过大量的仿真给出了各种不平衡输入情况下,采用不同的优化控制方案时瞬时有功功率、瞬时无功功率、瞬时功率因数以及输入电流谐波等波形,为三相PWM整流器在输入不平衡情况下的功率分析和优化控制提供了很好的理论基础。更多还原

【Abstract】 The thesis puts forward a new calculation method of tri-dimension instantaneous complex power based on coordinate conversion and symmetrical components.According to the instantaneous complex power,system input power could be decomposed as 12 power components,such as:instantaneous active power、reactance capacity between the axes of q0,dq and d0,etc.Two kinds of control strategy that one aims to suppress negative-sequence current AC side,while the other aims to suppress the secondary harmonic of input AC side,are analyzed in the thesis based on analysis of instantaneous power.The thesis has constructed a PWM rectifier simulation platform based on Saberr and has presented various waveforms of instantaneous active power,instantaneous reactance capacity,instantaneous power-factor and input current etc.By adopting different optimizing control algorithm in every unbalanced input case.These provide a firm theory base for the power analysis and optimizing control of the three-phase PWM rectifier in the case of unbalanced input.更多还原